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Permalink Reply by Jhonsel on July 19, 2013 at 9:36am

alot of people in the fish hobby dont go by watts per gallon any more i just because its about the lumens in the bulb and not nessarily the wattage. I would only go for the watts per gallon thing if your wor looking to illuminate your tank but growing plants is a different story.

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Permalink Reply by Stephen on July 19, 2013 at 10:02am

How many lumens would you go for?

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Permalink Reply by Fry on July 19, 2013 at 4:38pm

I use 1,500 lumen bulbs rated at 6500k rated 100watts, but I am running a weird set up using CFL bulbs

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Permalink Reply by Peter on July 19, 2013 at 10:05pm

First read this http://www.plantedtank.net/forums/showthread.php?t=184368.
Then read this http://fishtanktv.com/forum/topics/how-to-calculate-your-tank-lighting. First link explains y watts isnt used for bubls smaller than t12-t8. Second link is how to roughly estimate ur lumens

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